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  <title>The DateTimeImmutable class</title>

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 <h1 class="title">The DateTimeImmutable class</h1>
 

 <div class="partintro"><p class="verinfo">(PHP 5 &gt;= 5.5.0)</p>


  <div class="section" id="datetimeimmutable.intro">
   <h2 class="title">简介</h2>
   <p class="para">
    This class behaves the same as <a href="class.datetime.html" class="classname">DateTime</a> except it
    never modifies itself but returns a new object instead.
   </p>
  </div>


  <div class="section" id="datetimeimmutable.synopsis">
   <h2 class="title">类摘要</h2>


   <div class="classsynopsis">
    <div class="ooclass"></div>


    <div class="classsynopsisinfo">
     <span class="ooclass">
      <strong class="classname">DateTimeImmutable</strong>
     </span>
     
     <span class="oointerface">implements 
      <span class="interfacename"><a href="class.datetimeinterface.html" class="interfacename">DateTimeInterface</a></span>
     </span>
     {</div>

    
    <div class="classsynopsisinfo classsynopsisinfo_comment">/* 方法 */</div>
    <div class="constructorsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><a href="datetimeimmutable.construct.html" class="methodname">__construct</a></span>
    ([ <span class="methodparam"><span class="type">string</span> <code class="parameter">$time</code><span class="initializer"> = &quot;now&quot;</span></span>
   [, <span class="methodparam"><span class="type"><a href="class.datetimezone.html" class="type DateTimeZone">DateTimeZone</a></span> <code class="parameter">$timezone</code><span class="initializer"> = <strong><code>NULL</code></strong></span></span>
  ]] )</div>

    <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">DateTimeImmutable</span><span class="methodname"><a href="datetimeimmutable.add.html" class="methodname">add</a></span>
    ( <span class="methodparam"><span class="type"><a href="class.dateinterval.html" class="type DateInterval">DateInterval</a></span> <code class="parameter">$interval</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="modifier">static</span> <span class="type">DateTimeImmutable</span><span class="methodname"><a href="datetimeimmutable.createfromformat.html" class="methodname">createFromFormat</a></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$format</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$time</code></span>
   [, <span class="methodparam"><span class="type"><a href="class.datetimezone.html" class="type DateTimeZone">DateTimeZone</a></span> <code class="parameter">$timezone</code></span>
  ] )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="modifier">static</span> <span class="type">array</span><span class="methodname"><a href="datetimeimmutable.getlasterrors.html" class="methodname">getLastErrors</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">DateTimeImmutable</span><span class="methodname"><a href="datetimeimmutable.modify.html" class="methodname">modify</a></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$modify</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="modifier">static</span> <span class="type">DateTimeImmutable</span><span class="methodname"><a href="datetimeimmutable.set-state.html" class="methodname">__set_state</a></span>
    ( <span class="methodparam"><span class="type">array</span> <code class="parameter">$array</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">DateTimeImmutable</span><span class="methodname"><a href="datetimeimmutable.setdate.html" class="methodname">setDate</a></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$year</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$month</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$day</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">DateTimeImmutable</span><span class="methodname"><a href="datetimeimmutable.setisodate.html" class="methodname">setISODate</a></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$year</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$week</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$day</code><span class="initializer"> = 1</span></span>
  ] )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">DateTimeImmutable</span><span class="methodname"><a href="datetimeimmutable.settime.html" class="methodname">setTime</a></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$hour</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$minute</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$second</code><span class="initializer"> = 0</span></span>
  ] )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">DateTimeImmutable</span><span class="methodname"><a href="datetimeimmutable.settimestamp.html" class="methodname">setTimestamp</a></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$unixtimestamp</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">DateTimeImmutable</span><span class="methodname"><a href="datetimeimmutable.settimezone.html" class="methodname">setTimezone</a></span>
    ( <span class="methodparam"><span class="type"><a href="class.datetimezone.html" class="type DateTimeZone">DateTimeZone</a></span> <code class="parameter">$timezone</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">DateTimeImmutable</span><span class="methodname"><a href="datetimeimmutable.sub.html" class="methodname">sub</a></span>
    ( <span class="methodparam"><span class="type"><a href="class.dateinterval.html" class="type DateInterval">DateInterval</a></span> <code class="parameter">$interval</code></span>
   )</div>

    <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">DateInterval</span><span class="methodname"><a href="datetime.diff.html" class="methodname">diff</a></span>
    ( <span class="methodparam"><span class="type"><a href="class.datetimeinterface.html" class="type DateTimeInterface">DateTimeInterface</a></span> <code class="parameter">$datetime2</code></span>
   [, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$absolute</code><span class="initializer"> = false</span></span>
  ] )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">string</span><span class="methodname"><a href="datetime.format.html" class="methodname">format</a></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$format</code></span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">int</span><span class="methodname"><a href="datetime.getoffset.html" class="methodname">getOffset</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">int</span><span class="methodname"><a href="datetime.gettimestamp.html" class="methodname">getTimestamp</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">DateTimeZone</span><span class="methodname"><a href="datetime.gettimezone.html" class="methodname">getTimezone</a></span>
    ( <span class="methodparam">void</span>
   )</div>
<div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><a href="datetime.wakeup.html" class="methodname">__wakeup</a></span>
    ( <span class="methodparam">void</span>
   )</div>

   }</div>


  </div>

 </div>

 





















































































<h2>Table of Contents</h2><ul class="chunklist chunklist_reference"><li><a href="datetimeimmutable.add.html">DateTimeImmutable::add</a> — Adds an amount of days, months, years, hours, minutes and seconds</li><li><a href="datetimeimmutable.construct.html">DateTimeImmutable::__construct</a> — Returns new DateTimeImmutable object</li><li><a href="datetimeimmutable.createfromformat.html">DateTimeImmutable::createFromFormat</a> — Returns new DateTimeImmutable object formatted according to the specified format</li><li><a href="datetimeimmutable.getlasterrors.html">DateTimeImmutable::getLastErrors</a> — Returns the warnings and errors</li><li><a href="datetimeimmutable.modify.html">DateTimeImmutable::modify</a> — Alters the timestamp</li><li><a href="datetimeimmutable.set-state.html">DateTimeImmutable::__set_state</a> — The __set_state handler</li><li><a href="datetimeimmutable.setdate.html">DateTimeImmutable::setDate</a> — Sets the date</li><li><a href="datetimeimmutable.setisodate.html">DateTimeImmutable::setISODate</a> — Sets the ISO date</li><li><a href="datetimeimmutable.settime.html">DateTimeImmutable::setTime</a> — Sets the time</li><li><a href="datetimeimmutable.settimestamp.html">DateTimeImmutable::setTimestamp</a> — Sets the date and time based on an Unix timestamp</li><li><a href="datetimeimmutable.settimezone.html">DateTimeImmutable::setTimezone</a> — Sets the time zone</li><li><a href="datetimeimmutable.sub.html">DateTimeImmutable::sub</a> — Subtracts an amount of days, months, years, hours, minutes and seconds</li></ul>
</div>
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